thes efilms came out of an era when heros were and had been white, and targeting white audiences, all of a sudden black film makers made films for black audiences, with black heros, I see no offence. I think the term Blaxploitation is kinda.. hmm.. dumb or wrong, or something, they aren't/werent there to exploit black people, and thats what the term seems to most people.
Although people get it wrong with the term exploitation film in general, which WASN'T a genre that exploited characters or types within the film, it comes from the carnies, who EXPLOITED the CUSTOMERS.
Roll Up Roll UP! went to become SEE! SEE!
So, no, I dont think they are offensive, empowering, perhaps, I am not black, dunno.